Preview.app has interestingly become unusable and buggy/crashing for the last couple of macOS releases. Up to about OS X 10.9 it was s great and reliable tool.

Preview.app has interestingly become unusable and buggy/crashing for the last couple of macOS releases. Up to about OS X 10.9 it was s great and reliable tool. I wish Apple would publish the source to that old version so we could port it - but I’m afraid that quite a bit of the stability problems are related to PDF and other frameworks provided with the OS, not the app itself.